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Thermodynamic calculation of solubility of solid hydroxide M(OH)2 in water and alkaline mediaстатья
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Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
- Автор: Shkol'nikov E.V.
- Журнал: Russian Journal of Applied Chemistry
- Том: 77
- Номер: 8
- Год издания: 2004
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 1255
- Последняя страница: 1258
- DOI: 10.1007/s11167-005-0009-5
- Аннотация: Dependences of the molar solubility of amorphous and crystalline hydroxides M(OH)2 on pH of aqueous alkaline nonoxidizing medium at 25C, and also step constants of basicity and acidity of amphoteric hydroxides M(OH)2 (M = Be, Mn-Zn, Cd, Sn, Pb) were calculated by the thermodynamic method. The molar solubility of M(OH)2 hydroxidesin water grows as the ionicity of the chemical bondMO increases in the order BeMgCaSrBaand depends on their structure, decreasing on passingfrom the amorphous to the stable crystalline modification. The thermodynamic method is used to calculate the effect of the pH value on the solubility of thehydroxides M(OH)2 in an aqueous-alkaline medium.A condition for existence of amphoterism in M(OH)2(mean ligand number in the hydroxo complexesn > 2)and its estimate (parameter A > 1) increasing in theorder HgOCd(OH)2Be(OH)2Zn(OH)2 are suggested. The pH intervals in which cations of Group-IImetals are not bound into hydroxo complexes are determiRUSSIAN JOURNAL OF APPLIED CHEMISTRY Vol. 77 No. 8 20041258 SHKOL’NIKOV The minimum solubility and the pH values atwhich the precipitation of amphoteric hydroxides ofberyllium, zinc, and cadmium is the most completeare calculated with account of the formation of hydroxo complexes.
- Добавил в систему: Школьников Евгений Васильевич